Add a replication of MSVC2003's rand() algorithm

This actually affects how the game sounds. Seriously, listen to the
dialogue boxes. Now it matches the original.

Makefile

@@ -115,6 +115,7 @@ SOURCES = \
 	src/Organya \
 	src/PixTone \
 	src/Profile \
+	src/Random \
 	src/Resource \
 	src/SelStage \
 	src/Shoot \

src/Game.cpp

@@ -37,6 +37,7 @@
 #include "NpcHit.h"
 #include "NpcTbl.h"
 #include "Profile.h"
+#include "Random.h"
 #include "SelStage.h"
 #include "Shoot.h"
 #include "Sound.h"
@@ -54,7 +55,7 @@ BOOL bContinue;
 int Random(int min, int max)
 {
 	const int range = max - min + 1;
-	return min + rand() % range;
+	return min + msvc_rand() % range;
 }
 
 void PutNumber4(int x, int y, int value, BOOL bZero)

src/PixTone.cpp

@@ -6,6 +6,8 @@
 
 #include "WindowsWrapper.h"
 
+#include "Random.h"
+
 static signed char gWaveModelTable[6][256];
 
 void MakeWaveTables(void)
@@ -54,9 +56,9 @@ void MakeWaveTables(void)
 		gWaveModelTable[4][i] = -0x40;
 
 	// White noise wave
-	srand(0);
+	msvc_srand(0);
 	for (i = 0; i < 256; ++i)
-		gWaveModelTable[5][i] = (signed char)(rand() & 0xFF) / 2;
+		gWaveModelTable[5][i] = (signed char)(msvc_rand() & 0xFF) / 2;
 }
 
 BOOL MakePixelWaveData(const PIXTONEPARAMETER *ptp, unsigned char *pData)

src/Random.cpp

@@ -0,0 +1,15 @@
+#include "Random.h"
+
+// A replication of MSVC's rand algorithm
+static unsigned long next = 1;
+
+int msvc_rand(void)
+{
+	next = ((next) * 214013 + 2531011);
+	return ((next) >> 16) & 0x7FFF;
+}
+
+void msvc_srand(unsigned int seed)
+{
+	next = seed;
+}

src/Random.h

@@ -0,0 +1,4 @@
+#pragma once
+
+int msvc_rand(void);
+void msvc_srand(unsigned int seed);